Fix: add NONE to trend arrow

LoopFollow/ViewControllers/MainViewController.swift

@@ -360,7 +360,7 @@ class MainViewController: UIViewController, UITableViewDataSource, ChartViewDele
     func bgDirectionGraphic(_ value:String)->String
     {
         let //graphics:[String:String]=["Flat":"\u{2192}","DoubleUp":"\u{21C8}","SingleUp":"\u{2191}","FortyFiveUp":"\u{2197}\u{FE0E}","FortyFiveDown":"\u{2198}\u{FE0E}","SingleDown":"\u{2193}","DoubleDown":"\u{21CA}","None":"-","NOT COMPUTABLE":"-","RATE OUT OF RANGE":"-"]
-        graphics:[String:String]=["Flat":"→","DoubleUp":"↑↑","SingleUp":"↑","FortyFiveUp":"↗","FortyFiveDown":"↘︎","SingleDown":"↓","DoubleDown":"↓↓","None":"-","NOT COMPUTABLE":"-","RATE OUT OF RANGE":"-", "": "-"]
+        graphics:[String:String]=["Flat":"→","DoubleUp":"↑↑","SingleUp":"↑","FortyFiveUp":"↗","FortyFiveDown":"↘︎","SingleDown":"↓","DoubleDown":"↓↓","None":"-","NONE":"-","NOT COMPUTABLE":"-","RATE OUT OF RANGE":"-", "": "-"]
         return graphics[value]!
     }